Process of manufacture and composition of matter in forming stencil papers



Patented Oct. 30, 1934 *UNITED STATES.

PROCESS OF MANUFACTURE AND COM- POSITION OF MATTER IN FORDIING STENCIL PAPERS Leo M. Fink, Seattle, Wash, assignor, by direct and mesne assignments, of three-eighths to Ida T. Barnes, and one-eighth to Ralph W. Upton, both of Seattle, Wash.

No Drawing. Application December 15, 1929, Serial N0. 414,580

7 Claims.

This invention relates to the manufacture of stencil papers, and has particular reference to a novel process and the composition of matter produced, having as a general objective, the provision of a stencil composition peculiarly adaptable to overcoming the disadvantages inherent to stencil papers heretofore, to my knowledge, produced.

More specifically, an objective of my invention 10 lies in the provision of a stencil which is effective to preserve the composition against decomposition over an extended-period, being practically immune to the destructive effects of atmospheric and temperature changes.

A further object is the provision of a composition effective in the elimination of extreme hardening, brittleness, and such.

A still further and particular objective is the provision *of a composition effective to continued durability over long periods of use and under excessive pressures.

To which ends, the process preferably comprises the application to one side of a sheet of paper adapted to the reception of a stencil preparation, a mixture consisting in amyl acetate and formaldehyde, and applying to the opposite side a mixture consisting of camphorated oil, glycerine, amyl acetate, collodion and formaldehyde.

In effecting such, I employ in a preferred formula, quantities of each found to be especially advantageous, but which-I do not necessarily con- .fine' myself specifically to, it being considered evident that others might, without involving invention' derive advantageous results by experimental use of the respective or analogous elements.

In effecting the preparation to the commonly used Yoshino" paper, an extremely porous material, I apply to one side only of the paper, ,a preparation consisting by volume, proportionally, of

, Parts Amyl acetate -5 Formaldehyde 1 The paper is allowed to dry under suitable temperature and the opposite side coated with a preparation consisting by volume, proportional- 1y. of:

Parts camphorated nil 5 Glycerine 5 Amyl acetate 25 Collo 75 5s Formaldehyde A 8 The sheet is again allowed to dry, after which the stencil paper may be cut for application to an address card, letter form, or the like, according and as to the use desired.

Particular attention is asked to the fact that I derive an oil solution, through which the perforations may be desirably cut while dry, having attained a preservative (formaldehyde) with the peculiar and especial advantage of preventing decomposition of the elements while providing durability to continued strain.

Formulas, as used today, are commonly referred to as oil and water solutions, the advantage to the former residing in its adaptability to the reception of perforations while remaining in a dry state. However, heretofore, oil solutions have been unable to stand the continued pressure of an address stencil, the coat gradually giving way under stress.

For such reason, substantially all address ma.- chines necessitating pressure, have heretofore discarded oil solutions.

The water solution, utilizing the brittle pre-- servative alum requires a dampening of the stencil in order that'an ression will perforate through the sheet withou cracking the same.

My invention, as has, it is believed, become apparent, derives from formaldehyde, even greater advantages of durability than those at tributed to the alum of the water solution, with provision to a perforation while dry. Associated elements are peculiarly adapted to the provision of a most efficient stencil formulation.

What I claim, is:--

1. A composition of matter for preparin stencil papers, consisting of a mixture of camphorated oil, glycerine, amyl acetate, collodion and a preservative.

2. A composition of matter for preparing stencil papers, consisting of a mixture of camphorated oil, glycerine, amyl acetate, collodion and formaldehyde.

3. A composition of matter for preparing stencil papers, consisting of a mixture of substantially 5 parts of camphorated oil, 5 parts of glycerine, 25.parts oi amyl acetate, 75 parts of collodion, and 8 parts of formaldehyde.

4. The method of preparing stencil papers, which consists in treating one side of the sheet with a solution containing amyl acetate and formaldehyde, and'treating the other side of the sheet with a solution containing camphoratedoil, glycerine, amyl acetate, collodion and formaldehyde.

5. The method of preparing stencil papers, 110

aevaese with a solution containing amyi acetate and. a preservative, and treating the other side oi the sheet with a solution containing camphorated oil glycerine, amyl acetate, collodion, and a pre servative. i

'7. A composition of matter for use in the prep aration of stencil papers consisting of a mixture of a cellulose ester, a camphor-bearing oil, glye-= erine, and a preservative.

LEO M. FINE. 

